Abstract: The high temperature properties of 10 iron ores from Brazil,Australia and China were measured.By comparison with the optimal zone acquired from practical production statistics,several results were obtained as the following.The assimilability of Brazilian and Australian ores is lower and higher than the optical zone,respectively,but that of Chinese concentrate powders is close to the optical zone.The liquid-phase fluidity of two Brazilian ores,one Australian ore and one Chinese concentrate powder is optimal,one Brazilian ore,one Australian ore and two Chinese concentrate powders have low liquid-phase fluidity,but one Australian ore and one Chinese concentrate powder possess high liquid-phase fluidity.The self-strength of bonding phases in Australian ores is low,but optimal for Brazilian ores and Chinese concentrate powders,while the self-strength of bonding phases in Chinese concentrate powders is higher than in Brazilian ores.On the basis of experimental research,a new concept,which makes the high temperature properties of mixed ores optimal based on complementation of high temperature properties,was proposed,and the optimization schemes of ore blending were designed.The result of sinter pot test indicates that good sintering indexes are obtained,which proves the superiority of ore blending based on high temperature properties of iron ores.